Third proportional of $a$ and $b$ is

Third proportional of $a$ and $b$ is
  1. $\dfrac{b^{2}}{a}$
  2. $\dfrac{a^{2}}{b}$
  3. $ab$
  4. $\sqrt{ab}$

Solution

$a:b::b:x \Rightarrow x = \dfrac{b^{2}}{a}$.

Asked in: MH-SSC-9

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